RPG history takes place one month after the 10,000 players enter SAO, players are invited to enter the world of Sword Art Online to help players reach the 100th floor, so you enter through the BackOut of SAO and then into First floor of Sword Art Online.
Sorry for my English!

Systems

Interface
New Menu in Game
Hud with Name / HP
Professions With Skills Level
Fishing
Fishing and selling
Lumberjack
Cutting wood and selling to builders
Constructor
Build houses and benches

Blacksmith Create equipments with the resources that the Minerador collects
Miner
Extract resources to create new equipment.
PVP system
Guild Duels
Duel between Players
Tournaments
Extra Skills
HP Regeneration System
Spying players status
Speed
Explorer
Status
Skills and Combo
Four-side Combo
Make an attack of the 4 Sides of the npc, it takes out an extra damage of him
Skill of 2 swords in hand
Sword Skill